Arsenic pentoxide

Arsenic pentoxide is the inorganic compound with the formula As2O5. This glassy, white, deliquescent solid is relatively unstable, consistent with the rarity of the As(V) oxidation state. More common, and far more important commercially, is arsenic(III) oxide (As2O3). All inorganic arsenic compounds are highly toxic and thus find only limited commercial applications.

Diarsenic pentoxide
Names
Other names
Arsenic(V) oxide
Neutral arsenic oxide (2:5)
Arsenic anhydride
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.013.743
EC Number
  • 215-116-9
PubChem CID
RTECS number
  • CG2275000
UNII
UN number 1559
  • InChI=1S/As2O5/c3-1(4)7-2(5)6 Y
    Key: COHDHYZHOPQOFD-UHFFFAOYSA-N Y
  • InChI=1/As2O5/c3-1(4)7-2(5)6
    Key: COHDHYZHOPQOFD-UHFFFAOYAN
SMILES
  • O=[As](=O)O[As](=O)=O
Properties
As2O5
Molar mass 229.8402 g/mol
Appearance white hygroscopic powder
Density 4.32 g/cm3
Melting point 315 °C (599 °F; 588 K) (decomposes)
59.5 g/100 mL (0 °C)
65.8 g/100 mL (20 °C)
8.20 g/100 mL (100 °C)
Solubility soluble in alcohol
Acidity (pKa) 7
Hazards
GHS labelling:
Danger
H301, H331, H350, H410
P201, P202, P261, P264, P270, P271, P273, P281, P301+P310, P304+P340, P308+P313, P311, P321, P330, P391, P403+P233, P405, P501
NFPA 704 (fire diamond)
4
0
0
Lethal dose or concentration (LD, LC):
LD50 (median dose)
 8 mg/kg (rat, oral)
NIOSH (US health exposure limits):
PEL (Permissible)
 [1910.1018] TWA 0.010 mg/m3
REL (Recommended)
 Ca C 0.002 mg/m3 [15-minute]
IDLH (Immediate danger)
 Ca [5 mg/m3 (as As)]
Related compounds
Other cations
 Phosphorus pentoxide
Antimony pentoxide
Related compounds
 Arsenic trioxide
Arsenic acid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
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